背景:直到最近,费城阳性急性淋巴细胞白血病(Ph+ALL)患者的生存率约为30%.酪氨酸激酶抑制剂(TKIs),这是一类靶向BCR-ABL融合蛋白的新药,已证明可有效治疗成人Ph+ALL。然而,促进疾病复发的抗性机制改变了这些革命性药物的最初成功。
方法:一名71岁的中国女性患者,患有严重的肩背痛1周。
方法:由于以下项目,患者被诊断为Ph+ALL(B细胞)。全血细胞计数显示白细胞计数极异常(26.26×109/l),血红蛋白浓度(65克/升)和血小板计数(14×109/升)。由于骨髓抽吸物显示72.5%的淋巴母细胞和59.30%的淋巴母细胞被流式细胞术(FCM)证实。同时,实时荧光定量PCR分析证实P190BCR/ABL融合基因表达率为5.9%。核型分析表明:45,XX,-7,t(922)(q34;q11)[cp3]。
方法:患者接受化疗和不同的TKIs治疗,包括伊马替尼,达沙替尼,普纳替尼,和博舒替尼。
结果:患者在诊断后使用不同的TKI达到完全缓解,但随后复发并死于感染。
结论:对于接受序贯TKIs治疗的患者,BCR-ABL1激酶域内的多药耐药突变是一个新出现的临床问题。获得包含E255K/V的突变通常与ponatinib耐药有关,因此,有必要筛选出所有BCR/ABL突变的新的真正的泛抑制剂化合物,并确定未来基于阿司替尼的药物组合的潜在疗效.
BACKGROUND: Until recently, the survival rate in patients with Philadelphia-positive acute lymphoblastic leukemia (Ph+ ALL) was approximately 30%. Tyrosine kinase inhibitors (TKIs), which are a new class of drugs that target BCR-ABL fusion protein, have shown to be effective in treating Ph+ ALL in adults. However, the resistance mechanisms that promote the disease recurrence have altered the initial success of these revolutionary agents.
METHODS: A 71-year-old Chinese female patient who suffered from severe shoulder and back pain for 1 week.
METHODS: The patient was diagnosed with Ph+ ALL (B-cell) because of the following items. Complete blood count showed extremely abnormal white blood cell count (26.26×109/l), hemoglobin concentration (65 g/l) and platelet count (14×109/l). And because that Bone marrow aspirate showed 72.5% lymphoblasts and 59.30% lymphoblasts were confirmed by flow cytometry (FCM). At mean time, Real-time fluorescent quantitative PCR analysis confirmed that the P190 BCR/ABL fusion gene expression was 5.9%. Karyotype analysis indicated the following: 45, XX, -7, t (922) (q34; q11) [cp3].
METHODS: The patient was treated with chemotherapy and different TKIs including imatinib, dasatinib, ponatinib, and bosutinib.
RESULTS: The patient achieved complete remissions with different TKIs after diagnose but relapsed afterward and died of infection.
CONCLUSIONS: Multidrug-resistant mutations within the BCR-ABL1 kinase domain are an emerging clinical problem for patients receiving sequential TKIs therapy. Acquisition of E255K/V-inclusive mutations is usually associated with ponatinib resistance, thus it is necessary to screen out new real pan-inhibitor compounds for all BCR/ABL mutations and figure out the potential efficacy of asciminib-based drug combinations in the future.